The appearance of new Nokia firmware on NaviFirm is already enough to pique the interest of owners jonesing for an update, and this time there's especially strong reasons to get fired up: Windows Phone 7.8 upgrades for both the Lumia 510 and 800 have appeared on the servers. While their presence doesn't represent an official rollout, it supports notions that Nokia is edging closer to a deployment and gives those who live dangerously a chance to try 7.8 for themselves. We can't guarantee that phones will survive any unofficial transplants, but we'd love to hear from risk-takers who find something truly new in Microsoft's not-quite-8 release.